Hi, I just would like to chime in that the 1080 TI MSI Gaming X (without the fan shroud) fits in the Ncase M1 V6 with literally no room to spare.
The PCB is 140mm tall, but with the V6's refinement, there is no interference from the chassis flange at the rear-left. For the card, the PCIe power connectors are only slightly reccessed, standing around 130mm tall, so I could not use the normal connectors and close the case. Hence I had to use a set of low profile PCIe power connectors with the card, only then could I close the panels.
Because of how tall the PCB is, the top touches the side panel, effectively blocking off airflow to above (to the CPU area). I can now feel two distinct hot air sources, one from the GPU, the other from the CPU.
So for those looking for a new GPU, the very tallest your card should be is 140mm (at the middle and rear corner where it meets the PCIe bracket). if your card's PCIe power connectors is set around 130mm, you would need a set of low profile connectors to power the card and close the case.